Injection pen



FIG. 1 is a perspective view of the injection pen;

FIG. 2 is a side elevation view thereof;

FIG. 3 is another side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken-line disclosure shown in the drawings is understood to be for illustrative purposes only, and forms no part of the claimed design. 

CLAIM The ornamental design for an injection pen, as shown and described. 